1. Graduate School of Frontier Biosciences, Osaka University, Suita 565-0871, Japan
2. Institute of Molecular Biology, University of Oregon, Eugene, OR 97403, USA
3. Advanced ICT Research Institute Kobe, National Institute of Information and Communications Technology, Kobe 651-2492, Japan
4. Institute for Genetic Medicine, Hokkaido University, Sapporo 060-0815, Japan